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The sky
stratus
Stratus
the entire sky is filled with clouds
because gray clouds roll in (they are gray because they are full of rain)
A gray sky either has a lot of clouds (and is likely to produce rain) or is very polluted (Los Angeles is often like that).
from clouds
Layered or stratified clouds are stratus clouds. These types of clouds are low-lying gray clouds that sit under 6,000 feet.
Nimbostratus
No, they are flat, hazy, featureless clouds of low altitude varying in color from dark gray to nearly white.
Stratus
Clouds. But technically it is falling from the sky, from clouds in the sky.